Open AccessOverproduction of translation elongation factor 1‐α (eEF1A) suppresses the peroxisome biogenesis defect in a Hansenula polymorpha pex3 mutant via translational read‐through
Author(s) -
Kiel Jan A.K.W.,
Titorenko Vladimir I.,
Van Der Klei Ida J.,
Veenhuis Marten
Publication year - 2007
Publication title -
fems yeast research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 92
eISSN - 1567-1364
pISSN - 1567-1356
DOI - 10.1111/j.1567-1364.2007.00232.x
Subject(s) - biology , biogenesis , mutant , overproduction , microbiology and biotechnology , peroxisome , translation (biology) , eukaryotic translation , gene , translational regulation , elongation factor , genetics , biochemistry , rna , messenger rna , ribosome
In eukaryotes, elongation factor 1‐α (eEF1A) is required during the elongation phase of translation. We observed that a portion of the cellular eEF1A colocalizes with purified peroxisomes from the methylotrophic yeast Hansenula polymorpha . We have isolated two genes ( TEF1 and TEF2 ) that encode eEF1A, and which are constitutively expressed. We observed that overproduction of eEF1A suppressed the peroxisome deficient phenotype of an H. polymorpha pex3‐1 mutant, which was not observed in a strain deleted for PEX3 . The pex3‐1 allele contains a UGG to UGA mutation, thereby truncating Pex3p after amino acid 242, suggesting that the suppression effect might be the result of translational read‐through. Consistent with this hypothesis, overexpression of the pex3‐1 gene itself (including its now untranslated part) partly restored peroxisome biogenesis in a PEX3 null mutant. Subsequent co‐overexpression of TEF2 in this strain fully restored its peroxisome biogenesis defect and resulted in the formation of major amounts of full‐length Pex3p, presumably via translational read‐through.